Robin Lacassin
@rlacassin.bsky.social
Institut de Physique du Globe de Paris (IPGP - CNRS). Geology, tectonics, earthquakes, hazard epistemology & com. ⚒️ 🧪
Also: @[email protected]
https://www.ipgp.fr/~lacassin/RL-TectoniqueIPGP
https://tectoldies.mystrikingly.com/
Also: @[email protected]
https://www.ipgp.fr/~lacassin/RL-TectoniqueIPGP
https://tectoldies.mystrikingly.com/
This is a fake image, probably AI generated. Be careful. Don’t repost.
Very sad to see misinformation so frequently after disasters.
Very sad to see misinformation so frequently after disasters.
October 29, 2025 at 4:31 PM
This is a fake image, probably AI generated. Be careful. Don’t repost.
Very sad to see misinformation so frequently after disasters.
Very sad to see misinformation so frequently after disasters.
Disaster underway in #Jamaica.
#Melissa #hurricane making landfall along south-west coast of the island, with extremely low central pressure, and winds over 280 km/h. Massive rainfall predicted. Protect yourself, keep safe.
Source of data: www.tropicaltidbits.com/storminfo/
#Melissa #hurricane making landfall along south-west coast of the island, with extremely low central pressure, and winds over 280 km/h. Massive rainfall predicted. Protect yourself, keep safe.
Source of data: www.tropicaltidbits.com/storminfo/
October 28, 2025 at 2:59 PM
Disaster underway in #Jamaica.
#Melissa #hurricane making landfall along south-west coast of the island, with extremely low central pressure, and winds over 280 km/h. Massive rainfall predicted. Protect yourself, keep safe.
Source of data: www.tropicaltidbits.com/storminfo/
#Melissa #hurricane making landfall along south-west coast of the island, with extremely low central pressure, and winds over 280 km/h. Massive rainfall predicted. Protect yourself, keep safe.
Source of data: www.tropicaltidbits.com/storminfo/
October 26, 2025 at 9:11 PM
I love this amazing view of the Mer de Glace, above #Chamonix Mont-Blanc, with this small rounded gondola dwarfed by the grandeur of the mountains.
The Grandes Jorasses are in the back and the Dru pinnacle just left of the gondola. ⛰️
Photos by M. Serraillier in a book printed in 1962.
The Grandes Jorasses are in the back and the Dru pinnacle just left of the gondola. ⛰️
Photos by M. Serraillier in a book printed in 1962.
October 23, 2025 at 3:04 PM
I love this amazing view of the Mer de Glace, above #Chamonix Mont-Blanc, with this small rounded gondola dwarfed by the grandeur of the mountains.
The Grandes Jorasses are in the back and the Dru pinnacle just left of the gondola. ⛰️
Photos by M. Serraillier in a book printed in 1962.
The Grandes Jorasses are in the back and the Dru pinnacle just left of the gondola. ⛰️
Photos by M. Serraillier in a book printed in 1962.
When the ice was still there and quite high, though #glaciers were already retreating.
The Mer de Glace in the Mont Blanc massif, and the Rhonegletscher in the Swiss Valais/Wallis, at the beginning of the sixties. ⛰️
Photos by M. Serraillier in a book printed in 1962.
The Mer de Glace in the Mont Blanc massif, and the Rhonegletscher in the Swiss Valais/Wallis, at the beginning of the sixties. ⛰️
Photos by M. Serraillier in a book printed in 1962.
October 23, 2025 at 2:47 PM
When the ice was still there and quite high, though #glaciers were already retreating.
The Mer de Glace in the Mont Blanc massif, and the Rhonegletscher in the Swiss Valais/Wallis, at the beginning of the sixties. ⛰️
Photos by M. Serraillier in a book printed in 1962.
The Mer de Glace in the Mont Blanc massif, and the Rhonegletscher in the Swiss Valais/Wallis, at the beginning of the sixties. ⛰️
Photos by M. Serraillier in a book printed in 1962.
Found this excellent photograph of the #Matterhorn (in French #Cervin, in Italian #Cervino) east face with Hörnli ridge to the right. Photo taken by M. Serraillier printed in a book from 1962. 🏔️
October 21, 2025 at 2:33 PM
Found this excellent photograph of the #Matterhorn (in French #Cervin, in Italian #Cervino) east face with Hörnli ridge to the right. Photo taken by M. Serraillier printed in a book from 1962. 🏔️
In addition to praising María Corina Machado action for democracy, #Nobel Committee included these powerful words in its announcement.
"We live in a world where democracy is in retreat, where authoritarian regimes are challenging norms and resorting to violence."
www.nobelprize.org/prizes/peace...
"We live in a world where democracy is in retreat, where authoritarian regimes are challenging norms and resorting to violence."
www.nobelprize.org/prizes/peace...
October 10, 2025 at 9:29 AM
In addition to praising María Corina Machado action for democracy, #Nobel Committee included these powerful words in its announcement.
"We live in a world where democracy is in retreat, where authoritarian regimes are challenging norms and resorting to violence."
www.nobelprize.org/prizes/peace...
"We live in a world where democracy is in retreat, where authoritarian regimes are challenging norms and resorting to violence."
www.nobelprize.org/prizes/peace...
September 17, 2025 at 11:10 AM
September 17, 2025 at 11:08 AM
September 17, 2025 at 11:07 AM
September 17, 2025 at 11:05 AM
Just made a (crash) test with a renowned LLM #AI, asking about the #tectonics of the #Andes. It choses to end its (useless) text by proposing key readings: at least 3, maybe 4, do not exist (no paper on the Andes by Armijo, Garzione, Oncken as 1st author, at these dates; Liu I do not know). ⚒️🧪
🤡🤥
🤡🤥
September 5, 2025 at 1:31 PM
Just made a (crash) test with a renowned LLM #AI, asking about the #tectonics of the #Andes. It choses to end its (useless) text by proposing key readings: at least 3, maybe 4, do not exist (no paper on the Andes by Armijo, Garzione, Oncken as 1st author, at these dates; Liu I do not know). ⚒️🧪
🤡🤥
🤡🤥
About the 31/08 M6 #earthquake in #Afghanistan:
First #InSAR results by @uk-comet.bsky.social seem to suggest rupture of a secondary fault (dipping SE ?) in the mountains N of the main Kunar fault.
Blue is motion towards satellite in the unwrapped image. ⚒️
gws-access.jasmin.ac.uk/public/nceo_...
First #InSAR results by @uk-comet.bsky.social seem to suggest rupture of a secondary fault (dipping SE ?) in the mountains N of the main Kunar fault.
Blue is motion towards satellite in the unwrapped image. ⚒️
gws-access.jasmin.ac.uk/public/nceo_...
September 4, 2025 at 1:29 PM
About the 31/08 M6 #earthquake in #Afghanistan:
First #InSAR results by @uk-comet.bsky.social seem to suggest rupture of a secondary fault (dipping SE ?) in the mountains N of the main Kunar fault.
Blue is motion towards satellite in the unwrapped image. ⚒️
gws-access.jasmin.ac.uk/public/nceo_...
First #InSAR results by @uk-comet.bsky.social seem to suggest rupture of a secondary fault (dipping SE ?) in the mountains N of the main Kunar fault.
Blue is motion towards satellite in the unwrapped image. ⚒️
gws-access.jasmin.ac.uk/public/nceo_...
Section 👇 from Shnizai & Walker in Tektonika 2024 @wearetektonika.bsky.social shows structure of Jalalabad basin, E #Afghanistan.
It's not right across the recent #earthquake but more to the W. The earthquake may have occurred on a thrust fault equivalent to the one to the left of the section. 1/2 ⚒️
It's not right across the recent #earthquake but more to the W. The earthquake may have occurred on a thrust fault equivalent to the one to the left of the section. 1/2 ⚒️
September 1, 2025 at 9:42 AM
Section 👇 from Shnizai & Walker in Tektonika 2024 @wearetektonika.bsky.social shows structure of Jalalabad basin, E #Afghanistan.
It's not right across the recent #earthquake but more to the W. The earthquake may have occurred on a thrust fault equivalent to the one to the left of the section. 1/2 ⚒️
It's not right across the recent #earthquake but more to the W. The earthquake may have occurred on a thrust fault equivalent to the one to the left of the section. 1/2 ⚒️
Happy to read this paper by Vega-Ruiz et al. doi.org/10.1029/2025... and to see that the West Andean Thrust (WAT) has now another described segment.
It is ~250km S of the San Ramon Fault we have studied in several papers since 2010. These active faults are just facing main Chilean towns. ⚒️
It is ~250km S of the San Ramon Fault we have studied in several papers since 2010. These active faults are just facing main Chilean towns. ⚒️
August 27, 2025 at 12:45 PM
Happy to read this paper by Vega-Ruiz et al. doi.org/10.1029/2025... and to see that the West Andean Thrust (WAT) has now another described segment.
It is ~250km S of the San Ramon Fault we have studied in several papers since 2010. These active faults are just facing main Chilean towns. ⚒️
It is ~250km S of the San Ramon Fault we have studied in several papers since 2010. These active faults are just facing main Chilean towns. ⚒️
July 31, 2025 at 5:07 PM
July 31, 2025 at 5:06 PM
July 31, 2025 at 5:05 PM
#Kuril #earthquake sequence 2006-2009 👇. #Megathrust #earthquakes encircled in yellow, outer-rise events in green. Majority of outer-rises are extensional and shallow. But a compressional one happened deeper. Bending of oceanic crust explains these mechanisms.
⚒️ 2/2
Source doi:10.1029/2008JB006280
⚒️ 2/2
Source doi:10.1029/2008JB006280
July 31, 2025 at 8:16 AM
#Kuril #earthquake sequence 2006-2009 👇. #Megathrust #earthquakes encircled in yellow, outer-rise events in green. Majority of outer-rises are extensional and shallow. But a compressional one happened deeper. Bending of oceanic crust explains these mechanisms.
⚒️ 2/2
Source doi:10.1029/2008JB006280
⚒️ 2/2
Source doi:10.1029/2008JB006280
🇫🇷 Aux îles Marquises, le #tsunami dû au #séisme du #Kamchatka atteint pour le moment 1,70m d'inondation (runup). ⚒️
Attention, ce n'est pas terminé, continuez à vous protéger !
Attention, ce n'est pas terminé, continuez à vous protéger !
July 30, 2025 at 1:51 PM
🇫🇷 Aux îles Marquises, le #tsunami dû au #séisme du #Kamchatka atteint pour le moment 1,70m d'inondation (runup). ⚒️
Attention, ce n'est pas terminé, continuez à vous protéger !
Attention, ce n'est pas terminé, continuez à vous protéger !
A view 👇 of the #tsunami on the Kuril island of Paramushir, published online by Le Monde newspaper. ⚒️
www.lemonde.fr/planete/live...
www.lemonde.fr/planete/live...
July 30, 2025 at 10:36 AM
A view 👇 of the #tsunami on the Kuril island of Paramushir, published online by Le Monde newspaper. ⚒️
www.lemonde.fr/planete/live...
www.lemonde.fr/planete/live...
Reposting this with correct date (29 July) on map…
It seems that today's Mw8.8 #earthquake offshore S #Kamchatka has broken the same section of the megathrust than the big 1952 earthquake (also of magnitude 8.8 to 9). ⚒️
I wonder if only ~70 years could have been enough to reload the megathrust 🤔
It seems that today's Mw8.8 #earthquake offshore S #Kamchatka has broken the same section of the megathrust than the big 1952 earthquake (also of magnitude 8.8 to 9). ⚒️
I wonder if only ~70 years could have been enough to reload the megathrust 🤔
July 30, 2025 at 10:25 AM
Reposting this with correct date (29 July) on map…
It seems that today's Mw8.8 #earthquake offshore S #Kamchatka has broken the same section of the megathrust than the big 1952 earthquake (also of magnitude 8.8 to 9). ⚒️
I wonder if only ~70 years could have been enough to reload the megathrust 🤔
It seems that today's Mw8.8 #earthquake offshore S #Kamchatka has broken the same section of the megathrust than the big 1952 earthquake (also of magnitude 8.8 to 9). ⚒️
I wonder if only ~70 years could have been enough to reload the megathrust 🤔
It seems that today's Mw8.8 #earthquake offshore S #Kamchatka has broken the same section of the megathrust than the big 1952 earthquake (also of magnitude 8.8 to 9). ⚒️
I wonder if only ~70 years could have been enough to reload the megathrust 🤔
Reference of map in ALT
I wonder if only ~70 years could have been enough to reload the megathrust 🤔
Reference of map in ALT
July 30, 2025 at 9:33 AM
It seems that today's Mw8.8 #earthquake offshore S #Kamchatka has broken the same section of the megathrust than the big 1952 earthquake (also of magnitude 8.8 to 9). ⚒️
I wonder if only ~70 years could have been enough to reload the megathrust 🤔
Reference of map in ALT
I wonder if only ~70 years could have been enough to reload the megathrust 🤔
Reference of map in ALT
Aftershock distribution shows that the Mw8.8 #earthquake has propagated southward from offshore S #Kamchatka to the northern #Kuril islands, for at least 300km.
It likely started (epicenter of the Mw8.8 in blue) at the limit of the Mw7.4 rupture of the 20th of July.
2/2
It likely started (epicenter of the Mw8.8 in blue) at the limit of the Mw7.4 rupture of the 20th of July.
2/2
July 30, 2025 at 8:43 AM
Aftershock distribution shows that the Mw8.8 #earthquake has propagated southward from offshore S #Kamchatka to the northern #Kuril islands, for at least 300km.
It likely started (epicenter of the Mw8.8 in blue) at the limit of the Mw7.4 rupture of the 20th of July.
2/2
It likely started (epicenter of the Mw8.8 in blue) at the limit of the Mw7.4 rupture of the 20th of July.
2/2
It appears that the magnitude 7.4 #earthquake of the 20th of July was a foreshock for the Mw 8.7 to 8.8 of today offshore #Kamchatka.
Both seem to have broken the #megathrust where the Pacific oceanic plate subducts under Asia.
1/n
Both seem to have broken the #megathrust where the Pacific oceanic plate subducts under Asia.
1/n
July 30, 2025 at 8:35 AM
It appears that the magnitude 7.4 #earthquake of the 20th of July was a foreshock for the Mw 8.7 to 8.8 of today offshore #Kamchatka.
Both seem to have broken the #megathrust where the Pacific oceanic plate subducts under Asia.
1/n
Both seem to have broken the #megathrust where the Pacific oceanic plate subducts under Asia.
1/n